Paerdegat Basin – Combined Sewer Influent Channels (CSO)

Paerdegat Basin – Combined Sewer Influent Channels (CSO)

LiRo, as part of a Joint Venture, provided project management resident engineering inspection and CPM scheduling services for the construction of CSO Influent Channels, as the first phase of a combined sewer overflow retention and treatment facility.

The facility is located adjacent to a NYCDEP sewage pump station at the head end of Paerdegat Basin in Brooklyn. Access to the site is through a residential/commercial neighborhood in the Canarsie section of Brooklyn, which required coordination with local pedestrian and vehicular traffic, as well as continued access to DEP's existing facilities. Site security and safety were also extremely important.

The individual channels required site dewatering a minimum of two ft below channel sub-grade, the installation of reinforced concrete floors, walls and roofs, and subsequent leakeage testing prior to acceptance. In addition, an overflow chamber was constructed connecting the influent channels to the existing twin barrel overflow sewer from Ralph Avenue. Construction of an outfall chamber at the shoreline required pile installation, dredging, and tide gate installation. The site was subsequently backfilled to grade and sodded. Considerable coordination was required with an adjacent nursery including relocation/replacement of existing greenhouses, security fencing, and site access.

Other work items included 11,000 cy of concrete were poured at times requiring extended pouring schedules, extensive site dewatering, and excavation/excavation support. The project, under DEC Consent Order, is a key component of New York City's CSO Control Program.

Key Features:

  • Extensive dewatering
  • Excavation and excavation support
  • Heavy concrete placement
  • Site dredging
  • CPM scheduling and construction inspection

Services Provided

Resident/ Construction Engineering & Inspection